program: mkdirat(0xffffffffffffff9c, &(0x7f0000000080)='./config\x00', 0x1ff) mount(0x0, &(0x7f00000000c0)='./config\x00', &(0x7f0000000180)='configfs\x00', 0x0, 0x0) mkdirat(0xffffffffffffff9c, &(0x7f00000001c0)='./config/target\x00', 0x1ff) mkdirat(0xffffffffffffff9c, &(0x7f0000000240)='./config/target/core\x00', 0x1ff) mkdirat(0xffffffffffffff9c, &(0x7f0000000280)='./config/target/core/rd_mcp_0\x00', 0x1ff) mkdirat(0xffffffffffffff9c, &(0x7f00000002c0)='./config/target/core/rd_mcp_0/rd1\x00', 0x1ff) r0 = openat(0xffffffffffffff9c, &(0x7f0000000340)='./config/target/core/rd_mcp_0/rd1/control\x00', 0x2, 0x0) write(r0, &(0x7f0000000380)='rd_pages=32768\x00', 0xe) r1 = openat(0xffffffffffffff9c, &(0x7f00000003c0)='./config/target/core/rd_mcp_0/rd1/enable\x00', 0x2, 0x0) write(r1, &(0x7f0000000400)='1\x00', 0x1) mkdirat(0xffffffffffffff9c, &(0x7f0000000440)='./config/usb_gadget\x00', 0x1ff) mkdirat(0xffffffffffffff9c, &(0x7f0000000480)='./config/usb_gadget/g1\x00', 0x1ff) r2 = openat(0xffffffffffffff9c, &(0x7f00000004c0)='./config/usb_gadget/g1/idVendor\x00', 0x2, 0x0) write(r2, &(0x7f0000000500)='0x1d6b\x00', 0x6) r3 = openat(0xffffffffffffff9c, &(0x7f0000000540)='./config/usb_gadget/g1/idProduct\x00', 0x2, 0x0) write(r3, &(0x7f0000000580)='0x0104\x00', 0x6) mkdirat(0xffffffffffffff9c, &(0x7f00000005c0)='./config/usb_gadget/g1/functions\x00', 0x1ff) mkdirat(0xffffffffffffff9c, &(0x7f0000000600)='./config/usb_gadget/g1/functions/tcm.0\x00', 0x1ff) mkdirat(0xffffffffffffff9c, &(0x7f0000000640)='./config/usb_gadget/g1/configs\x00', 0x1ff) mkdirat(0xffffffffffffff9c, &(0x7f0000000680)='./config/usb_gadget/g1/configs/c.1\x00', 0x1ff) mkdirat(0xffffffffffffff9c, &(0x7f00000006c0)='./config/target/usb_gadget\x00', 0x1ff) mkdirat(0xffffffffffffff9c, &(0x7f0000000700)='./config/target/usb_gadget/naa.6001405123456789\x00', 0x1ff) mkdirat(0xffffffffffffff9c, &(0x7f0000000740)='./config/target/usb_gadget/naa.6001405123456789/tpgt_1\x00', 0x1ff) mkdirat(0xffffffffffffff9c, &(0x7f0000000780)='./config/target/usb_gadget/naa.6001405123456789/tpgt_1/lun\x00', 0x1ff) mkdirat(0xffffffffffffff9c, &(0x7f00000007c0)='./config/target/usb_gadget/naa.6001405123456789/tpgt_1/lun/lun_0\x00', 0x1ff) symlinkat(&(0x7f0000000840)='./config/target/core/rd_mcp_0/rd1\x00', 0xffffffffffffff9c, &(0x7f0000000880)='./config/target/usb_gadget/naa.6001405123456789/tpgt_1/lun/lun_0/rd1\x00') r4 = openat(0xffffffffffffff9c, &(0x7f0000000900)='./config/target/usb_gadget/naa.6001405123456789/tpgt_1/nexus\x00', 0x2, 0x0) write(r4, &(0x7f0000000940)='naa.6001405123456789\x00', 0x14) symlinkat(&(0x7f0000000980)='./config/usb_gadget/g1/functions/tcm.0\x00', 0xffffffffffffff9c, &(0x7f00000009c0)='./config/usb_gadget/g1/configs/c.1/tcm.0\x00') r5 = openat(0xffffffffffffff9c, &(0x7f0000000a00)='./config/target/usb_gadget/naa.6001405123456789/tpgt_1/enable\x00', 0x2, 0x0) write(r5, &(0x7f0000000a40)='1\x00', 0x1) r6 = openat(0xffffffffffffff9c, &(0x7f0000000a80)='./config/usb_gadget/g1/UDC\x00', 0x2, 0x0) write(r6, &(0x7f0000000ac0)='dummy_udc.0\x00', 0xb) nanosleep(&(0x7f0000000000)={0x1}, 0x0) r7 = syz_open_dev$sg(0x0, 0x0, 0x0) ioctl$SG_IO(r7, 0x2285, &(0x7f0000000100)={0x53, 0xfffffffe, 0xa, 0x0, @buffer={0x0, 0x1c, &(0x7f0000000200)=""/28}, &(0x7f0000000300)="5f000000000000001c00", &(0x7f0000000400), 0x0, 0x0, 0x0, 0x0}) [ 84.967660][ T24] audit: type=1800 audit(1785849661.949:2): pid=5325 uid=0 auid=4294967295 ses=4294967295 subj=unconfined op=collect_data cause=failed comm="syz.0.0" name="enable" dev="configfs" ino=4253 res=0 errno=0 [ 84.991649][ T24] audit: type=1800 audit(1785849661.959:3): pid=5325 uid=0 auid=4294967295 ses=4294967295 subj=unconfined op=collect_data cause=failed comm="syz.0.0" name="idVendor" dev="configfs" ino=4260 res=0 errno=0 [ 85.005882][ T5325] se_device not configured yet, cannot port link [ 85.011001][ T24] audit: type=1800 audit(1785849661.959:4): pid=5325 uid=0 auid=4294967295 ses=4294967295 subj=unconfined op=collect_data cause=failed comm="syz.0.0" name="idProduct" dev="configfs" ino=4261 res=0 errno=0 [ 85.024396][ T24] audit: type=1800 audit(1785849661.989:5): pid=5325 uid=0 auid=4294967295 ses=4294967295 subj=unconfined op=collect_data cause=failed comm="syz.0.0" name="nexus" dev="configfs" ino=4282 res=0 errno=0 [ 85.032169][ T5325] [ 85.033207][ T5325] ====================================================== [ 85.036054][ T5325] WARNING: possible circular locking dependency detected [ 85.038859][ T5325] syzkaller #0 Not tainted [ 85.040716][ T5325] ------------------------------------------------------ [ 85.043489][ T5325] syz.0.0/5325 is trying to acquire lock: [ 85.045779][ T5325] ffffffff8fa50d80 (tpg_instances_lock){+.+.}-{4:4}, at: tcm_alloc+0x21/0x2e0 [ 85.049357][ T5325] [ 85.049357][ T5325] but task is already holding lock: [ 85.052333][ T5325] ffff888012fcc390 (&gi->lock){+.+.}-{4:4}, at: config_usb_cfg_link+0x59/0x260 [ 85.055983][ T5325] [ 85.055983][ T5325] which lock already depends on the new lock. [ 85.055983][ T5325] [ 85.060138][ T5325] [ 85.060138][ T5325] the existing dependency chain (in reverse order) is: [ 85.063703][ T5325] [ 85.063703][ T5325] -> #3 (&gi->lock){+.+.}-{4:4}: [ 85.066610][ T5325] __mutex_lock+0x19d/0x1550 [ 85.068662][ T5325] config_usb_cfg_link+0x59/0x260 [ 85.070899][ T5325] configfs_symlink+0x59a/0x1030 [ 85.073093][ T5325] vfs_symlink+0x18b/0x330 [ 85.075084][ T5325] filename_symlinkat+0x1cd/0x410 [ 85.077318][ T5325] __se_sys_symlinkat+0x4e/0x2b0 [ 85.079491][ T5325] do_syscall_64+0x174/0x580 [ 85.081608][ T5325] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 85.084209][ T5325] [ 85.084209][ T5325] -> #2 (&sb->s_type->i_mutex_key#24){++++}-{4:4}: [ 85.087667][ T5325] down_write+0x96/0x200 [ 85.089611][ T5325] configfs_depend_item_unlocked+0x153/0x420 [ 85.091961][ T5325] usbg_make_tpg+0x1f6/0x590 [ 85.093629][ T5325] target_fabric_make_tpg+0xa8/0x6d0 [ 85.095646][ T5325] configfs_mkdir+0x4f6/0x9e0 [ 85.097599][ T5325] vfs_mkdir+0x406/0x620 [ 85.099539][ T5325] filename_mkdirat+0x285/0x510 [ 85.101749][ T5325] __se_sys_mkdirat+0x35/0x150 [ 85.103960][ T5325] do_syscall_64+0x174/0x580 [ 85.106080][ T5325] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 85.108764][ T5325] [ 85.108764][ T5325] -> #1 (&opts->dep_lock){+.+.}-{4:4}: [ 85.111982][ T5325] __mutex_lock+0x19d/0x1550 [ 85.114130][ T5325] usbg_make_tpg+0x147/0x590 [ 85.116292][ T5325] target_fabric_make_tpg+0xa8/0x6d0 [ 85.118755][ T5325] configfs_mkdir+0x4f6/0x9e0 [ 85.120929][ T5325] vfs_mkdir+0x406/0x620 [ 85.122940][ T5325] filename_mkdirat+0x285/0x510 [ 85.125131][ T5325] __se_sys_mkdirat+0x35/0x150 [ 85.127297][ T5325] do_syscall_64+0x174/0x580 [ 85.129395][ T5325] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 85.131993][ T5325] [ 85.131993][ T5325] -> #0 (tpg_instances_lock){+.+.}-{4:4}: [ 85.135226][ T5325] __lock_acquire+0x1520/0x2cf0 [ 85.137497][ T5325] lock_acquire+0x106/0x350 [ 85.139586][ T5325] __mutex_lock+0x19d/0x1550 [ 85.141698][ T5325] tcm_alloc+0x21/0x2e0 [ 85.143631][ T5325] usb_get_function+0x63/0xb0 [ 85.145752][ T5325] config_usb_cfg_link+0x148/0x260 [ 85.148093][ T5325] configfs_symlink+0x59a/0x1030 [ 85.150287][ T5325] vfs_symlink+0x18b/0x330 [ 85.152350][ T5325] filename_symlinkat+0x1cd/0x410 [ 85.154615][ T5325] __se_sys_symlinkat+0x4e/0x2b0 [ 85.156889][ T5325] do_syscall_64+0x174/0x580 [ 85.159000][ T5325] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 85.161636][ T5325] [ 85.161636][ T5325] other info that might help us debug this: [ 85.161636][ T5325] [ 85.165692][ T5325] Chain exists of: [ 85.165692][ T5325] tpg_instances_lock --> &sb->s_type->i_mutex_key#24 --> &gi->lock [ 85.165692][ T5325] [ 85.171026][ T5325] Possible unsafe locking scenario: [ 85.171026][ T5325] [ 85.173794][ T5325] CPU0 CPU1 [ 85.175540][ T5325] ---- ---- [ 85.177364][ T5325] lock(&gi->lock); [ 85.178743][ T5325] lock(&sb->s_type->i_mutex_key#24); [ 85.181407][ T5325] lock(&gi->lock); [ 85.183498][ T5325] lock(tpg_instances_lock); [ 85.185054][ T5325] [ 85.185054][ T5325] *** DEADLOCK *** [ 85.185054][ T5325] [ 85.187666][ T5325] 3 locks held by syz.0.0/5325: [ 85.189285][ T5325] #0: ffff8880002e6450 (sb_writers#12){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 [ 85.192252][ T5325] #1: ffff88801f910f80 (&sb->s_type->i_mutex_key#24){++++}-{4:4}, at: configfs_symlink+0x3af/0x1030 [ 85.195753][ T5325] #2: ffff888012fcc390 (&gi->lock){+.+.}-{4:4}, at: config_usb_cfg_link+0x59/0x260 [ 85.198733][ T5325] [ 85.198733][ T5325] stack backtrace: [ 85.200687][ T5325] CPU: 0 UID: 0 PID: 5325 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) [ 85.200697][ T5325] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 85.200702][ T5325] Call Trace: [ 85.200707][ T5325] [ 85.200711][ T5325] dump_stack_lvl+0xe8/0x150 [ 85.200723][ T5325] print_circular_bug+0x2e1/0x300 [ 85.200732][ T5325] check_noncircular+0x12e/0x150 [ 85.200741][ T5325] __lock_acquire+0x1520/0x2cf0 [ 85.200753][ T5325] ? __lock_acquire+0x13e8/0x2cf0 [ 85.200764][ T5325] ? __pfx_stack_trace_save+0x10/0x10 [ 85.200775][ T5325] ? tcm_alloc+0x21/0x2e0 [ 85.200784][ T5325] lock_acquire+0x106/0x350 [ 85.200795][ T5325] ? tcm_alloc+0x21/0x2e0 [ 85.200804][ T5325] __mutex_lock+0x19d/0x1550 [ 85.200814][ T5325] ? tcm_alloc+0x21/0x2e0 [ 85.200821][ T5325] ? trace_contention_end+0x3d/0x140 [ 85.200829][ T5325] ? __mutex_lock+0x30d/0x1550 [ 85.200837][ T5325] ? tcm_alloc+0x21/0x2e0 [ 85.200845][ T5325] ? __pfx___mutex_lock+0x10/0x10 [ 85.200854][ T5325] ? __pfx___mutex_lock+0x10/0x10 [ 85.200863][ T5325] tcm_alloc+0x21/0x2e0 [ 85.200871][ T5325] usb_get_function+0x63/0xb0 [ 85.200879][ T5325] config_usb_cfg_link+0x148/0x260 [ 85.200889][ T5325] configfs_symlink+0x59a/0x1030 [ 85.200896][ T5325] ? lookup_one_qstr_excl+0x1d4/0x360 [ 85.200906][ T5325] ? make_vfsuid+0x49/0xa0 [ 85.200913][ T5325] ? __pfx_configfs_symlink+0x10/0x10 [ 85.200920][ T5325] ? bpf_lsm_inode_symlink+0x9/0x20 [ 85.200931][ T5325] vfs_symlink+0x18b/0x330 [ 85.200937][ T5325] ? security_path_symlink+0xfd/0x360 [ 85.200951][ T5325] filename_symlinkat+0x1cd/0x410 [ 85.200958][ T5325] ? __pfx_filename_symlinkat+0x10/0x10 [ 85.200965][ T5325] ? do_getname+0x151/0x250 [ 85.200973][ T5325] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 85.200980][ T5325] __se_sys_symlinkat+0x4e/0x2b0 [ 85.200988][ T5325] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 85.200995][ T5325] do_syscall_64+0x174/0x580 [ 85.201004][ T5325] ? trace_irq_disable+0x3b/0x140 [ 85.201014][ T5325] ? clear_bhb_loop+0x40/0x90 [ 85.201022][ T5325] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 85.201030][ T5325] RIP: 0033:0x7f3b5e39e019 [ 85.201038][ T5325] Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 [ 85.201044][ T5325] RSP: 002b:00007f3b5f1c3fe8 EFLAGS: 00000246 ORIG_RAX: 000000000000010a [ 85.201052][ T5325] RAX: ffffffffffffffda RBX: 00007f3b5e625fa0 RCX: 00007f3b5e39e019 [ 85.201057][ T5325] RDX: 00002000000009c0 RSI: ffffffffffffff9c RDI: 0000200000000980 [ 85.201062][ T5325] RBP: 00007f3b5e43500c R08: 0000000000000000 R09: 0000000000000000 [ 85.201067][ T5325] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 85.201071][ T5325] R13: 00007f3b5e626038 R14: 00007f3b5e625fa0 R15: 00007ffec63ce858 [ 85.201078][ T5325] [ 85.303908][ T24] audit: type=1800 audit(1785849662.289:6): pid=5326 uid=0 auid=4294967295 ses=4294967295 subj=unconfined op=collect_data cause=failed comm="syz.0.0" name="enable" dev="configfs" ino=4283 res=0 errno=0 [ 85.311612][ T24] audit: type=1800 audit(1785849662.289:7): pid=5326 uid=0 auid=4294967295 ses=4294967295 subj=unconfined op=collect_data cause=failed comm="syz.0.0" name="UDC" dev="configfs" ino=4284 res=0 errno=0 [ 85.552989][ T10] usb 5-1: new high-speed USB device number 2 using dummy_hcd [ 85.569795][ T5285] Bluetooth: hci0: command tx timeout [ 85.703882][ T10] usb 5-1: Dual-Role OTG device on HNP port [ 85.706748][ T10] usb 5-1: New USB device found, idVendor=1d6b, idProduct=0104, bcdDevice= 7.02 [ 85.710635][ T10] usb 5-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0 [ 85.717335][ T5312] Using the BOT protocol [ 85.724610][ T5312] Using the UAS protocol [ 85.731860][ T10] scsi host6: uas